Kenko Digital Zeta L41 UltraViolet Filter

"The Kenko Digital Zeta L41 UV Filter is the ultimate filter for both digital photography and film. The L41 UV filters are designed to absorb the ultraviolet rays which can often make outdoor photographs look hazy and indistinct. This multi-purpose, all-around filter can serve as a permanent lens protector. The Zeta UV L41 filter absorbs up to 410nm (wavelengths) of ultra violet rays. Normal UV glass has a slight yellow tint but the L41 is perfectly clear due to the use of high-performance glass.

Key features of the Digital Zeta L41 Filters
L41 Super UV Cut Glass - The Zeta UV L41 filter absorbs up to 410nm of ultraviolet rays. Normal UV glass has a slight yellow tint, but the L41 is perfectly clear due of the use of a high-performance glass.
ZR (zero reflection) Super Multi Coating – This innovative coating will not interfere with any colour or light transmission. Reflections are eliminated by allowing light to enter the filter at virtually any angle. This filter will produce superior results and can be used with any type of lens (wide angle to telephoto).
Ultra Smooth Surface Nano Glass Technology – Our Nano Glass Technology creates an ultra smooth surface from the finest particles of glass, making it stain and scratch resistant without any effect to the image.
High End Constructed Ultra Thin Frame - The glass of this lens is precision machined and attached using Retainer Ring Mount Technology giving this filter an unsurpassed durability. An ultra thin frame also makes it wide-angle lens compatible.
Sophisticated Filter Case - Sleek design and durable, a protective and easy to use polycarbonate resin compact case comes with every Zeta filter.
The Kenko Digital Zeta L41 UV Filters are available in the following thread sizes: 49mm, 52mm, 55mm, 58mm, 62mm, 67mm, 72mm, 77mm and 82mm."